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agriculture pytrhium potato late blight irish famine downy mildew plant disease cellulose cell wall eukaryotic microorganisms oomycota oospores karuppu kavuni mapillai samba popular variety in tamil nadu name of traditional varieties cauvery delta zone rice glycemic index medicinal benefits of rice nutritional benefits of rice plant physiology organic rice traditional rice variety plant diseases phytoalexin mode of action of phytoalexin types of phytoalexins shikimic acid pathway defense mechanism plant pathogenic interaction history of phosporusdiscovery trends of psm biofertilizers benefits factots of solubilization mode of plant growth promotio chelation edta organic acids mechanism of action psm isolation of psm phosphate solubilizing org human impact phosphorus cycle forms in soil usesrole phosphorus history fungal bacterial inoculants benefits of psb why phosphorus matters brown stripe downy mildew sorghum downy mildew green ear of bajra albugo crazy top mycolaminarin leotomitales sexual reproduction in achyla saprolegniales d/w true fungi and pseudo fung